Constraints on Black-Hole Charges with the 2017 EHT Observations of M87*

Total Page:16

File Type:pdf, Size:1020Kb

Constraints on Black-Hole Charges with the 2017 EHT Observations of M87* PHYSICAL REVIEW D 103, 104047 (2021) Constraints on black-hole charges with the 2017 EHT observations of M87* – Prashant Kocherlakota ,1 Luciano Rezzolla,1 3 Heino Falcke,4 Christian M. Fromm,5,6,1 Michael Kramer,7 Yosuke Mizuno,8,9 Antonios Nathanail,9,10 H´ector Olivares,4 Ziri Younsi,11,9 Kazunori Akiyama,12,13,5 Antxon Alberdi,14 Walter Alef,7 Juan Carlos Algaba,15 Richard Anantua,5,6,16 Keiichi Asada,17 Rebecca Azulay,18,19,7 Anne-Kathrin Baczko,7 David Ball,20 Mislav Baloković,5,6 John Barrett,12 Bradford A. Benson,21,22 Dan Bintley,23 Lindy Blackburn,5,6 Raymond Blundell,6 Wilfred Boland,24 Katherine L. Bouman,5,6,25 Geoffrey C. Bower,26 Hope Boyce,27,28 – Michael Bremer,29 Christiaan D. Brinkerink,4 Roger Brissenden,5,6 Silke Britzen,7 Avery E. Broderick,30 32 Dominique Broguiere,29 Thomas Bronzwaer,4 Do-Young Byun,33,34 John E. Carlstrom,35,22,36,37 Andrew Chael,38,39 Chi-kwan Chan,20,40 Shami Chatterjee,41 Koushik Chatterjee,42 Ming-Tang Chen,26 Yongjun Chen (陈永军),43,44 Paul M. Chesler,5 Ilje Cho,33,34 Pierre Christian,45 John E. Conway,46 James M. Cordes,41 Thomas M. Crawford,22,35 Geoffrey B. Crew,12 Alejandro Cruz-Osorio,9 Yuzhu Cui,47,48 Jordy Davelaar,49,16,4 Mariafelicia De Laurentis,50,9,51 – Roger Deane,52 54 Jessica Dempsey,23 Gregory Desvignes,55 Sheperd S. Doeleman,5,6 Ralph P. Eatough,56,7 Joseph Farah,6,5,57 Vincent L. Fish,12 Ed Fomalont,58 Raquel Fraga-Encinas,4 Per Friberg,23 H. Alyson Ford,59 Antonio Fuentes,14 Peter Galison,5,60,61 Charles F. Gammie,62,63 Roberto García,29 Olivier Gentaz,29 Boris Georgiev,31,32 Ciriaco Goddi,4,64 Roman Gold,65,30 Jos´e L. Gómez,14 Arturo I. Gómez-Ruiz,66,67 Minfeng Gu (顾敏峰),43,68 Mark Gurwell,6 Kazuhiro Hada,47,48 Daryl Haggard,27,28 Michael H. Hecht,12 Ronald Hesper,69 Luis C. Ho (何子山),70,71 – Paul Ho,17 Mareki Honma,47,48,72 Chih-Wei L. Huang,17 Lei Huang (黄磊),43,68 David H. Hughes,66 Shiro Ikeda,13,73 75 Makoto Inoue,17 Sara Issaoun,4 David J. James,5,6 Buell T. Jannuzi,20 Michael Janssen,7 Britton Jeter,31,32 Wu Jiang (江悟),43 Alejandra Jimenez-Rosales,4 Michael D. Johnson,5,6 Svetlana Jorstad,76,77 Taehyun Jung,33,34 Mansour Karami,30,31 Ramesh Karuppusamy,7 Tomohisa Kawashima,78 Garrett K. Keating,6 Mark Kettenis,79 Dong-Jin Kim,7 Jae-Young Kim,33,7 Jongsoo Kim,33 Junhan Kim,20,25 Motoki Kino,13,80 Jun Yi Koay,17 Yutaro Kofuji,47,72 Patrick M. Koch,17 Shoko Koyama,17 Carsten Kramer,29 Thomas P. Krichbaum,7 Cheng-Yu Kuo,81,17 Tod R. Lauer,82 Sang-Sung Lee,33 Aviad Levis,25 Yan-Rong Li (李彦荣),83 Zhiyuan Li (李志远),84,85 Michael Lindqvist,46 Rocco Lico,14,7 Greg Lindahl,6 Jun Liu (刘俊),7 Kuo Liu,7 Elisabetta Liuzzo,86 Wen-Ping Lo,17,87 Andrei P. Lobanov,7 Laurent Loinard,88,89 – Colin Lonsdale,12 Ru-Sen Lu (路如森),43,44,7 Nicholas R. MacDonald,7 Jirong Mao (毛基荣),90 92 Nicola Marchili,86,7 Sera Markoff,42,93 Daniel P. Marrone,20 Alan P. Marscher,76 Iván Martí-Vidal,18,19 Satoki Matsushita,17 Lynn D. Matthews,12 Lia Medeiros,94,20 Karl M. Menten,7 Izumi Mizuno,23 James M. Moran,5,6 Kotaro Moriyama,12,47 Monika Moscibrodzka,4 Cornelia Müller,7,4 Gibwa Musoke,42,4 Alejandro Mus Mejías,18,19 Hiroshi Nagai,13,48 Neil M. Nagar,95 Masanori Nakamura,96,17 Ramesh Narayan,5,6 Gopal Narayanan,97 Iniyan Natarajan,54,52,98 Joseph Neilsen,99 Roberto Neri,29 Chunchong Ni,31,32 Aristeidis Noutsos,7 Michael A. Nowak,100 Hiroki Okino,47,72 Gisela N. Ortiz-León,7 Tomoaki Oyama,47 Feryal Özel,20 Daniel C. M. Palumbo,5,6 Jongho Park,17 Nimesh Patel,6 – Ue-Li Pen,30,101 103 Dominic W. Pesce,5,6 Vincent Pi´etu,29 Richard Plambeck,104 Aleksandar PopStefanija,97 Oliver Porth,42,9 Felix M. Pötzl,7 Ben Prather,62 Jorge A. Preciado-López,30 Dimitrios Psaltis,20 Hung-Yi Pu,105,17,30 Venkatessh Ramakrishnan,95 Ramprasad Rao,26 Mark G. Rawlings,23 Alexander W. Raymond,5,6 Angelo Ricarte,5,6 Bart Ripperda,106,16 Freek Roelofs,4 Alan Rogers,12 Eduardo Ros,7 Mel Rose,20 Arash Roshanineshat,20 Helge Rottmann,7 Alan L. Roy,7 Chet Ruszczyk,12 Kazi L. J. Rygl,86 Salvador Sánchez,107 David Sánchez-Arguelles,66,67 Mahito Sasada,47,108 Tuomas Savolainen,109,110,7 F. Peter Schloerb,97 Karl-Friedrich Schuster,29 Lijing Shao,7,71 Zhiqiang Shen (沈志强),43,44 Des Small,79 Bong Won Sohn,33,34,111 Jason SooHoo,12 He Sun (孙赫),25 Fumie Tazaki,47 Alexandra J. Tetarenko,112 Paul Tiede,31,32 Remo P. J. Tilanus,4,64,113,20 Michael Titus,12 Kenji Toma,114,115 Pablo Torne,7,107 Tyler Trent,20 Efthalia Traianou,7 Sascha Trippe,116 Ilse van Bemmel,79 Huib Jan van Langevelde,79,117 Daniel R. van Rossum,4 Jan Wagner,7 Derek Ward-Thompson,118 John Wardle,119 Jonathan Weintroub,5,6 Norbert Wex,7 Robert Wharton,7 Maciek Wielgus,5,6 George N. Wong,62 Qingwen Wu (吴庆文),120 Doosoo Yoon,42 Andr´e Young,4 Ken Young,6 Feng Yuan (袁峰),43,68,121 Ye-Fei Yuan (袁业飞),122 J. Anton Zensus,7 Guang-Yao Zhao,14 and Shan-Shan Zhao43 (EHT Collaboration) 1Institut für Theoretische Physik, Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany 2Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, 60438 Frankfurt, Germany 3School of Mathematics, Trinity College, Dublin 2, Ireland 4Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, P.O. Box 9010, 6500 GL Nijmegen, Netherlands 5Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, Massachusetts 02138, USA 2470-0010=2021=103(10)=104047(18) 104047-1 Published by the American Physical Society PRASHANT KOCHERLAKOTA et al. PHYS. REV. D 103, 104047 (2021) 6Center for Astrophysics—Harvard & Smithsonian, 60 Garden Street, Cambridge, Massachusetts 02138, USA 7Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany 8Tsung-Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China 9Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, Germany 10Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, GR 15783 Zografos, Greece 11Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, United Kingdom 12Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, Massachusetts 01886, USA 13National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 14Instituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain 15Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia 16Center for Computational Astrophysics, Flatiron Institute, 162 Fifth Avenue, New York, New York 10010, USA 17Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan, R.O.C. 18Departament d’Astronomia i Astrofísica, Universitat de Val`encia, C. Dr. Moliner 50, E-46100 Burjassot, Val`encia, Spain 19Observatori Astronòmic, Universitat de Val`encia, C. Catedrático Jos´e Beltrán 2, E-46980 Paterna, Val`encia, Spain 20Steward Observatory and Department of Astronomy, University of Arizona, 933 N. Cherry Avenue, Tucson, Arizona 85721, USA 21Fermi National Accelerator Laboratory, MS209, P.O. Box 500, Batavia, Illinois 60510, USA 22Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois 60637, USA 23East Asian Observatory, 660 N. A’ohoku Place, Hilo, Hawaii 96720, USA 24Nederlandse Onderzoekschool voor Astronomie (NOVA), PO Box 9513, 2300 RA Leiden, Netherlands 25California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA 26Institute of Astronomy and Astrophysics, Academia Sinica, 645 N. A’ohoku Place, Hilo, Hawaii 96720, USA 27Department of Physics, McGill University, 3600 rue University, Montr´eal, Quebec City H3A 2T8, Canada 28McGill Space Institute, McGill University, 3550 rue University, Montr´eal, Quebec City H3A 2A7, Canada 29Institut de Radioastronomie Millim´etrique, 300 rue de la Piscine, F-38406 Saint Martin d’H`eres, France 30Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario, N2L 2Y5, Canada 31Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada 32Waterloo Centre for Astrophysics, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada 33Korea Astronomy and Space Science Institute, Daedeok-daero 776, Yuseong-gu, Daejeon 34055, Republic of Korea 34University of Science and Technology, Gajeong-ro 217, Yuseong-gu, Daejeon 34113, Republic of Korea 35Kavli Institute for Cosmological Physics, University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois 60637, USA 36Department of Physics, University of Chicago, 5720 South Ellis Avenue, Chicago, Illinois 60637, USA 37Enrico Fermi Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois 60637, USA 38Princeton Center for Theoretical Science, Jadwin Hall, Princeton University, Princeton, New Jersey 08544, USA 39NASA Hubble Fellowship Program, Einstein Fellow 40Data Science Institute, University of Arizona, 1230 N. Cherry Avenue, Tucson, Arizona 85721, USA 41Cornell Center for Astrophysics and Planetary Science, Cornell University, Ithaca, New York 14853, USA 42Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, Netherlands 43Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China 104047-2 CONSTRAINTS ON BLACK-HOLE CHARGES WITH THE 2017 … PHYS.
Recommended publications
  • Dream Image the Search for That One Elusive Image
    What? Dream image The search for that one elusive image. Why? The gravitational force around a black hole is so strong that it distorts time and space: even light cannot escape. Demonstrating the existence of black holes confirms the theories Einstein developed on gravity in physics. Who? Heino Falcke, professor of radio astronomy and astroparticle physics at the Radboud University Nijmegen, together with colleagues from Radboud University, the University of Amsterdam, Leiden University and the The shadow of University of Groningen, as well as an international team of astronomers. Where? Eight telescopes spread across the globe that together form the Event Horizon Telescope (EHT). the black hole Result? The first image of the shadow of a black hole. Finally we know what a black hole looks like. In April, an international team of astronomers presented the very first image of the shadow of a black hole. ‘ TEXT: MARION DE BOO IMAGES : HOLLANDSE HOOGTE ‘I felt like Christopher Columbus. We Big dreams saw things that none of us had ever Did he ever doubt this wild plan? ‘I often have big dreams, seen before,’ says Heino Falcke. On 10 it’s in my DNA. And then I’ll do everything in my power to April 2019, the radio astronomer working make them come true,’ Falcke says. ‘But until that mo- in Nijmegen presented the very first ima- ment arrives, you’re never sure if it’s really going to suc- ge of the light bending around the black ceed.’ In 1994 he obtained his PhD summa cum laude at hole in M87 galaxy.
    [Show full text]
  • Foreign Rights Guide
    FOREIGN RIGHTS GUIDE Spring 2020 Fiction Non-Fiction FICTION FICTION HIGHLIGHT Based on a true story ENGLISH BOOKLET AVAILABLE A powerful novel about history’s darkest chapter, the German secret service in New SAMPLE TRANSLATION AVAILABLE York City and the activities of Nazis in Manhattan in the late 1930s. End of the 30s: Before the Americans entered the war, the streets of New York are in a tumult. Anti-Semitic and racist groups are eager for the sympathy of the masses, German nationalists celebrate Hitler as the man of the hour. Josef Klein, himself an immigrant from Germany, lives relatively untouched by all this. His world is the multicultural streets of Harlem. His great passion is the amateur radio. That is how he meets Lauren, Miss Doubleyoutwo, a young activist who has great sympathy for the calm German. But Josef‘s technical abilities as a radio operator attract the attention of influential men, and even before he can interpret the events correctly, Josef is already a little cog in the big wheel of the espionage network of the German defense. Ulla Lenze delivers a smart and gripping novel about the unknown history of the Germans in the US during the Second World War. The incredible life story of the emigrant Josef Klein, who is targeted by the world powers in New York, reveals the espionage activities of the Nazi regime in the US and tells about political entanglements far away from home. Ulla Lenze Highly acclaimed author The Radio Operator Sold into 9 territories before 302 pages publication Hardcover February 2020 ISBN: 978-3-608-96463-9 Rights sold to: Italy/Marsilio, The Netherlands/ Meridiaan, USA/HarperVia (English WR), Brazil/Harper Collins, France/Hachette (Lattès), Finland/Like Publishing, Croatia/Fraktura, Ulla Lenze, born in Mönchengladbach in 1973, studied Music and Spain/Salamandra, Greece/Patakis Philosophy in Cologne.
    [Show full text]
  • Global Program
    PROGRAM Monday morning, July 13th La Sapienza Roma - Aula Magna 09:00 - 10:00 Inaugural Session Chairperson: Paolo de Bernardis Welcoming addresses Remo Ruffini (ICRANet), Yvonne Choquet-Bruhat (French Académie des Sciences), Jose’ Funes (Vatican City), Ricardo Neiva Tavares (Ambassador of Brazil), Sargis Ghazaryan (Ambassador of Armenia), Francis Everitt (Stanford University) and Chris Fryer (University of Arizona) Marcel Grossmann Awards Yakov Sinai, Martin Rees, Sachiko Tsuruta, Ken’Ichi Nomoto, ESA (acceptance speech by Johann-Dietrich Woerner, ESA Director General) Lectiones Magistrales Yakov Sinai (Princeton University) 10:00 - 10:35 Deterministic chaos Martin Rees (University of Cambridge) 10:35 - 11:10 How our understanding of cosmology and black holes has been revolutionised since the 1960s 11:10 - 11:35 Group Picture - Coffee Break Gerard 't Hooft (University of Utrecht) 11:35 - 12:10 Local Conformal Symmetry in Black Holes, Standard Model, and Quantum Gravity Plenary Session: Mathematics and GR Katarzyna Rejzner (University of York) 12:10 - 12:40 Effective quantum gravity observables and locally covariant QFT Zvi Bern (UCLA Physics & Astronomy) 12:40 - 13:10 Ultraviolet surprises in quantum gravity 14:30 - 18:00 Parallel Session 18:45 - 20:00 Stephen Hawking (teleconference) (University of Cambridge) Public Lecture Fire in the Equations Monday afternoon, July 13th Code Classroom Title Chairperson AC2 ChN1 MHD processes near compact objects Sergej Moiseenko FF Extended Theories of Gravity and Quantum Salvatore Capozziello, Gabriele AT1 A Cabibbo Cosmology Gionti AT3 A FF3 Wormholes, Energy Conditions and Time Machines Francisco Lobo Localized selfgravitating field systems in the AT4 FF6 Dmitry Galtsov, Michael Volkov Einstein and alternatives theories of gravity BH1:Binary Black Holes as Sources of Pablo Laguna, Anatoly M.
    [Show full text]
  • EU-Funded Scientists Unveil First Ever Image of a Black Hole
    European Commission - Press release EU-funded scientists unveil first ever image of a black hole Brussels, 10 April 2019 The Commission is today revealing the first ever image of a black hole taken by Event Horizon Telescope, a global scientific collaboration involving EU-funded scientists. This major discovery provides visual evidence for the existence of black holes and pushes the boundaries of modern science. The first ever observation of a black hole is the result of the large scale international research collaboration Event Horizon Telescope (EHT), where EU-funded researchers have played a key role. This major scientific achievement marks a paradigm shift in our understanding of black holes, confirms the predictions of Albert Einstein's General Theory of Relativity and opens up new lines of enquiry into our universe. The first image of a black hole successfully captured was unveiled in six simultaneous press conferences across the globe today. Commissioner Carlos Moedas, responsible for Research, Science, and Innovation, said: “Fiction often inspires science, and black holes have long fueled our dreams and curiosity. Today, thanks to the contribution of European scientists, the existence of black holes is no longer just a theoretical concept. This amazing discovery proves again how working together with partners around the world can lead to achieving the unthinkable and moving the horizons of our knowledge.” President of the European Research Council (ERC), Professor Jean-Pierre Bourguignon, added: “I congratulate the scientists across the globe who made this inspiring discovery and pushed the frontiers of our knowledge. I'm especially glad to see that scientists funded by the European Research Council contributed decisively to this breakthrough.
    [Show full text]
  • Separating Accretion and Mergers in the Cosmic Growth of Black Holes with X-Ray and Gravitational Wave Observations
    Draft version May 4, 2020 Typeset using LATEX twocolumn style in AASTeX61 SEPARATING ACCRETION AND MERGERS IN THE COSMIC GROWTH OF BLACK HOLES WITH X-RAY AND GRAVITATIONAL WAVE OBSERVATIONS Fabio Pacucci1, 2 and Abraham Loeb1, 2 1Black Hole Initiative, Harvard University, Cambridge, MA 02138, USA 2Center for Astrophysics j Harvard & Smithsonian, Cambridge, MA 02138, USA ABSTRACT Black holes across a broad range of masses play a key role in the evolution of galaxies. The initial seeds of black holes formed at z ∼ 30 and grew over cosmic time by gas accretion and mergers. Using observational data for quasars and theoretical models for the hierarchical assembly of dark matter halos, we study the relative importance of gas accretion and mergers for black hole growth, as a function of redshift (0 < z < 10) and black hole mass 3 10 (10 M < M• < 10 M ). We find that (i) growth by accretion is dominant in a large fraction of the parameter 8 5 space, especially at M• > 10 M and z > 6; and (ii) growth by mergers is dominant at M• < 10 M and z > 5:5, 8 and at M• > 10 M and z < 2. As the growth channel has direct implications for the black hole spin (with gas accretion leading to higher spin values), we test our model against ∼ 20 robust spin measurements available thus far. As expected, the spin tends to decline toward the merger-dominated regime, thereby supporting our model. The next generation of X-ray and gravitational-wave observatories (e.g. Lynx, AXIS, Athena and LISA) will map out populations of black holes up to very high redshift (z ∼ 20), covering the parameter space investigated here in almost its entirety.
    [Show full text]
  • MG15 Plenary Session
    Monday, July 2 Tuesday, July 3 Wednesday, July 4 Thursday, July 5 Friday, July 6 Saturday, July 7 KILONOVAE AND GRAVITATIONAL MULTIMESSANGER Topic MATHEMATICS AND GENERAL RELATIVITY FUTURE PRECISION TESTS OF GR GRBs AND CMB THE FRONTIERS WAVES ASTROPHYSICS Chair: CLAUS LAEMMERZAHL Chair: MARCO TAVANI Chair: REMO RUFFINI Chair: ENRICO COSTA Chair: PAOLO GIOMMI Chair: FULVIO RICCI Marcel Grossmann Awards ELENA PIAN STEFANO VITALE VICTORIA KASPI RAZMIK MIRZOYAN MARKUS ARNDT 1. LYMAN PAGE Kilonovae: the cosmic Gravitation Wave Gamma-Ray and Experiments to Probe 9.00 – 9.35 Fast Radio Bursts 2. THE PLANCK SCIENTIFIC COLLABORATION foundries of heavy elements Astronomy in ESA science Multi-Messenger Quantum Linearity at the 3. RASHID SUNYAEV programme Highlights with MAGIC Interface to Gravity & 4. HEPL - Stanford Complexity 5. SHING-TUNG YAU NIAL TANVIR TAKAAKI KAJITA BING ZHANG ELISA RESCONI TOBIAS WESTPHAL Lectio Magistralis A new era of gravitational- From gamma-ray bursts Neutrino Astronomy in Micro-mechanical Status of KAGRA and its 9.35-10.10 wave/electromagnetic to fast radio bursts: the Multi-messenger measurements of weak scientific goals SHING-TUNG YAU multi-messenger astronomy unveiling the mystery of Era gravitational forces Quasi-local mass at null infinity cosmic bursting sources MASAKI ANDO FRANCIS HALZEN SHU ZHANG TSVI PIRAN RASHID SUNYAEV DECIGO : Gravitational-Wave JEAN-LOUP PUGET IceCube: Opening a Introduction to Insight- Mergers and GRBs: past 10.10-10.45 Observation from Space The Planck mission New Window on the HXMT:
    [Show full text]
  • Arxiv:2010.05354V1 [Gr-Qc] 11 Oct 2020
    Black hole or Gravastar? The GW190521 case I. Antoniou1, ∗ 1Department of Physics, University of Ioannina, GR-45110, Ioannina, Greece (Dated: August 31, 2021) The existence of cosmological compact objects with very strong gravity is a prediction of General Relativity and an exact solution of the Einstein equations. These objects are called black holes and recently we had the first observations of them. However, the theory of black hole formation has some disadvantages. In order to avoid these, some scientists suggest the existence of gravastars (gravitation vacuum stars), an alternative stellar model which seems to solve the problems of the black hole theory. In this work we compare black holes and gravastars using a wide range of the literature and we emphasize the properties of gravastars, which are consistent with the current cosmological observations. Also, we propose gravastars as the solution of the ”pair-instability” effect and a possible explanation for the observed masses of the compact objects, before the collapse, from the gravitational signal GW190521, since in the formation of a gravastar there aren’t mass restrictions. PACS numbers: 98.62.Ai, 04.20.Cv, 04.30.-w I. INTRODUCTION black holes, or some other compact object with very strong gravity. Many scientists dispute the One of the most attractive concepts in Gen- existence of black holes because if we take into ac- eral Relativity is the existence and the properties count quantum effects, the gravitational collapse of black holes, a region of spacetime where grav- of objects comes to a halt and furthermore no ity is so strong that nothing, no particles or even event horizon forms [2].
    [Show full text]
  • Effelsberg Newsletter January 2012
    Effelsberg Newsletter Volume 3 w Issue 1 w January 2012 Effelsberg Newsletter January 2012 Call for Proposals Deadline for Effelsberg Proposals is February 8, 2012, 13.00 UT. Page 2 Greetings from the Director Content Page 2 Call for Proposals It is a pleasure to wish you a very happy new year 2012! It has been a very busy last year, with lots of changes and new instrumentation Page 4 First results of the described in the past issues of this newsletter. Even more interesting Effelsberg-Bonn HI Survey changes lie ahead of us, and as usual, we will keep you posted about all the progress being made. We will also continue to give you a glimpse Page 6 Effelsberg delivers first of the science highlights achieved with the 100-m telescope, and it is fringes with Radioastron: also a pleasure to introduce you to further members of staff and to Space VLBI sets a new report on our outreach activities. world-record in radio interferometry. The output and the performance of the telescope is going strong, underlining its superb capabilities even 40 years after its inauguration. Page 7 Who is Who in Effelsberg? Peter Vogt This is not surprising, given that the telescope and its instruments are constantly upgraded. Still, we are only half-way through our activities Page 8 Public Outreach: celebrating these 40 years. Further highlights are still to follow - stay Extension of the tuned! We will give you further details in the upcoming issues of this Effelsberg Milky Way newsletter, which now has a new look.
    [Show full text]
  • Press Kit Draft(1)
    B L A C K H O L E S -------------- T H E E D G E O F A L L W E K N O W A film by Peter Galison Contact: Director/Producer: Peter Galison, [email protected] Editor/Co-Producer: Chyld King, [email protected] Distribution: Submarine Entertainment, [email protected] Media: [email protected] Online: www.blackholefilm.com Runtime: 98 min www.blackholefilm.com 1 About the Film Logline Black holes stand at the edge of the knowable universe. The Event Horizon Telescope pursues the first picture of a black hole; Stephen Hawking and collaborators attack the black hole paradox at the heart of physics. Black Holes | The Edge of All We Know follows observers, theorists, and philosophers hunting these most mysterious objects. Synopsis What can black holes teach us about the boundaries of knowledge? These holes in spacetime are the darkest objects and the brightest—the simplest and the most complex. With unprecedented access, Black Holes | The Edge of All We Know follows two powerhouse collaborations. Stephen Hawking anchors one, striving to show that black holes do not annihilate the past. Another group, working in the world’s highest altitude observatories, creates an earth-sized telescope to capture the first-ever image of a black hole. Interwoven with other dimensions of exploring black holes, these stories bring us to the pinnacle of humanity’s quest to understand the universe. www.blackholefilm.com 2 www.blackholefilm.com 3 Director’s Statement I began filming Black Holes | The Edge of All We Know in the spring of 2016, when five colleagues and I launched the Black Hole Initiative, an interdisciplinary center for the study of black holes.
    [Show full text]
  • TWO POSTDOCTORAL POSITIONS in RADIO ASTRONOMY at the Mpifr in BONN, GERMANY Submission Address: Prof
    TWO POSTDOCTORAL POSITIONS IN RADIO ASTRONOMY AT THE MPIfR IN BONN, GERMANY Submission address: Prof. Dr. J. Anton Zensus Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 D-53123 Bonn, Germany Tel. +49 228 525 298 [email protected] Contact information for inquiries: Prof. Dr. Eduardo Ros Tel. +49 228 525 125 [email protected] Deadline: Dec 1st, 2017 The Max-Planck-Institut für Radioastronomie (MPIfR) is recruiting up to two postdoctoral reserachers in radio astronomy. These positions are based in the Radio Astronomy/VLBI department led by Prof. J. Anton Zensus. The department has a broad research portfolio. Research topics focus on the investigation of compact extragalactic objects (AGN) and their broad-band emission, with a special emphasis on very-high-resolution studies. These include mm- and space-VLBI imaging and blazar monitoring with F-GAMMA/MOJAVE/TANAMI. The MPIfR operates the 100-m radio telescope in Effelsberg (element of EVN and GMVA), and it is major partner of APEX in Chile (element of EHT). It also operates a state-of-the-art VLBI correlator and the LOFAR DE1 station, which is part of the International LOFAR Telescope. We are looking for researchers with a science interest matching our research topics. Technical mastery of radio interferometry techniques and VLBI is of advantage, as well as a good publication record. Candidates with complementary skills to our research portfolio are especially encouraged to apply. The appointee will be expected to engage in one or more of our research lines and to collaborate closely with other department members. The International Max Planck Research School for Astronomy and Astrophysics (IMPRS) offers the opportunity for joint research with PhD students, their supervision, and teaching in the program.
    [Show full text]
  • Curriculum Vitae – Edo Berger
    Curriculum Vitae – Edo Berger Professor of Astronomy Harvard College Observatory, MS-19, 60 Garden Street, Cambridge, MA 02138 [email protected] https://scholar.harvard.edu/eberger Education Ph.D., Astrophysics, California Institute of Technology May 2004 Advisor: Prof. Shrinivas R. Kulkarni Cosmic Explosions: The Beasts and Their Lair M.S., Astrophysics, California Institute of Technology May 2001 Advisor: Prof. Shrinivas R. Kulkarni B.S., Astrophysics (Summa Cum Laude), University of California, Los Angeles June 1999 Advisor: Prof. Bernard M. K. Nefkens The Total and Differential Cross Sections of the Reaction K−p → Λη. Positions Professor of Astronomy, Harvard University 2014– John L. Loeb Associate Professor of the Natural Sciences, Harvard University 2011–2014 Associate Professor of Astronomy, Harvard University 2011–2014 Assistant Professor, Harvard University 2008–2011 Carnegie-Princeton Postdoctoral Fellow, Princeton /Carnegie Observatories 2004–2008 Hubble Postdoctoral Fellow, Carnegie Observatories 2004–2007 Honors and Awards CSH Distinguished Lectures University of Bern 2018 Star Family Challenge for Promising Scientific Research, Harvard University 2016 Fannie Cox Prize for Excellence in Science Teaching, Harvard University 2013 Robert J. Trumpler Award for an Outstanding PhD Thesis, Astronomical Society 2007 of the Pacific Kingsley Fellowship, California Institute of Technology 2002 E. Lee Kinsey Prize, University of California, Los Angeles 1999 Professional Services SOC, “10th Sackler Conference in Theoretical Astrophysics:
    [Show full text]
  • Reaching an Agreement on UK Participation in Horizon Eu
    Securing a strong outcome for research in the EU-UK future relationship: Reaching an agreement on UK participation in Horizon Europe The EU and UK have been discussing UK participation in Union Programmes, including Horizon Europe, as part of the negotiations on a future EU-UK relationship. It is encouraging that both sides have committed to the principle of UK participation in their mandates, recognising that collaboration between the UK and the EU in the framework programmes strengthens our ability to tackle shared challenges, such as cancer and climate change. It is vital that this commitment now translates quickly into an agreement on the terms of participation. Horizon Europe association should be a core part of the future relationship between the EU and the UK for research, underpinning valuable scientific partnerships that have been built up over many years. We have all reaped the health benefits of these collaborations. Clinical trials, particularly on diseases with limited patient populations, are reliant on EU-UK collaboration, while close research partnerships continue to accelerate life-changing medical research. Our ability to respond to the threat of climate change and outbreaks of new diseases like Covid-19 has also been greatly improved by close scientific and clinical partnerships across Europe. Knowledge and discovery do not stop at borders, and the shared global challenges we face require joint solutions. Collaboration through the research framework programmes is a springboard to productive partnerships across the world. We owe it to future generations in the UK, the EU and beyond to ensure that the new EU-UK relationship best serves them through research.
    [Show full text]